72520117 has 2 divisors, whose sum is σ = 72520118. Its totient is φ = 72520116.

The previous prime is 72520109. The next prime is 72520141. The reversal of 72520117 is 71102527.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46703556 + 25816561 = 6834^2 + 5081^2 .

It is a cyclic number.

It is not a de Polignac number, because 72520117 - 2³ = 72520109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72520091 and 72520100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72520157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36260058 + 36260059.

It is an arithmetic number, because the mean of its divisors is an integer number (36260059).

Almost surely, 2^72520117 is an apocalyptic number.

It is an amenable number.

72520117 is a deficient number, since it is larger than the sum of its proper divisors (1).

72520117 is an equidigital number, since it uses as much as digits as its factorization.

72520117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 72520117 is about 8515.8744119438. The cubic root of 72520117 is about 417.0161092715.

The spelling of 72520117 in words is "seventy-two million, five hundred twenty thousand, one hundred seventeen".